Brother Tom Butler:
Thank you for your input.
Let me attempt to satisfy your questions by starting from the bottom up. You said:"......how you define an ambassador".
Helen, earlier, and I think a few other posters, gave definitions of what an ambassador is. In essence, they say an ambassador is one who is sent to represent someone, or a country, or a kingdom. I concur. Further, dictionary.com defines ambassador as :
am·bas·sa·dor
–noun 1.a diplomatic official of the highest rank, sent by one sovereign or state to another as its resident representative (ambassador extraordinary and plenipotentiary). 2.a diplomatic official of the highest rank sent by a government to represent it on a temporary mission, as for negotiating a treaty. 3.a diplomatic official serving as permanent head of a country's mission to the United Nations or some other international organization. 4.an authorized messenger or representative.
Surprisingly, dictionary.com also cites the Easton's Bible Dictionary :
Ambassador
In the Old Testament the Hebrew word _tsir_, meaning "one who goes on an errand," is rendered thus (Josh. 9:4; Prov. 13:17; Isa. 18:2; Jer. 49:14; Obad. 1:1). This is also the rendering of _melits_, meaning "an interpreter," in 2 Chr. 32:31; and of _malak_, a "messenger," in 2 Chr. 35:21; Isa. 30:4; 33:7; Ezek. 17:15. This is the name used by the apostle as designating those who are appointed by God to declare his will (2 Cor. 5:20; Eph. 6:20). The Hebrews on various occasions and for various purposes had recourse to the services of ambassadors, e.g., to contract alliances (Josh. 9:4), to solicit favours (Num. 20:14), to remonstrate when wrong was done (Judg. 11:12), to condole with a young king on the death of his father (2 Sam. 10:2), and to congratulate a king on his accession to the throne (1 Kings 5:1). To do injury to an ambassador was to insult the king who sent him (2 Sam. 10:5).
Easton's 1897 Bible Dictionary
If you notice, all these definitions have one common thread running in them: authority.
The authority to represent themselves as ambassadors, the authority invested upon them to invoke the name or sovereignty of the sending power.
It is interesting to me that Baptists, Primitive or not, are big on authority. We rebaptize those whom we consider to have received an alien baptism, because we do not (1) know the church, or the authority that baptized them, or (2) we do not outrightly recognize that authority, yet here we grant authority to those to whom the Bible never granted it.
Let us now examine several personalities in the Bible whom we can rightfully and scripturally call Ambassadors. In the Old Testament, we had Moses of the Hebrews. He was personally called out by Jehovah for that purpose. Jehovah introduced Himself to Moses. Jehovah chose Moses over Aaron, although Aaron was sent along with Moses. He was the ambassador of Jehovah to Pharaoh, in the matter of releasing His people from Pharaoh's grip.
He was Jehovah's ambassador to the Hebrews, tasked with representing Jehovah whose name they had not known previously, and tasked with informing the Hebrews as to Jehovah's laws and will.
In the New Testament, we had:
a. John the Baptist - a man sent from God (John 1:6);
b. Jesus Christ - (John 12:50; John 14:10; John 17:1-4);
c. The Holy Spirit - (John 14:26; John 15:26)
d. The Apostles - (Matthew 10:1-4; Mark 16:14-15;Matthew 28:16-20).
e. Paul - (2 Cor. 5:20;Eph. 6:20) and by implication, those who were with him in the ministry, to include Timothy, Barnabas, Luke.
All the above spoke on authority of the Triune God, all the above had their authority affirmed by the Triune God, written down on Scripture and preserved for the learning and admonition of God's people thru the ages (Romans 15:4;
Just as not all Israel can call themselves, or have been called by Jehovah God, to be ambassadors, not all in the churches and certainly not all Christians are called to be ambassadors.
Paul certainly never taught that, and even to say that the Church, as an entity, is an ambassador for Christ, is taking Scripture where it never goes.
I will continue to answer your questions at a later time.
Forgive me, I do not mean to be rude.
It's just that my wife and I at this day happen to have the same day off, and have been invited to dine with a kind and loving Reformed Baptist church in Hamburg, New York, which we attended several times last Fall, pastored by a fine, Godly man, Joe Krieger.